JPS6023546B2 - effect waveform generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an effects waveform generator for television special effects.

Conventionally, as an example of a TV special effect, as shown in FIG. 1, there is one in which side A and side B are clearly placed on the screen.

FIG. 2 is a basic configuration diagram of the slave effect generator. A synchronizing signal is supplied from terminal 1, and based on it, the fundamental wave generating circuit 2 generates effects corresponding to horizontal and vertical synchronization. The basic waveforms necessary for this purpose are created. Basic waveforms include sawtooth waves, triangular waves, parabolic waves, etc.
Used depending on the desired effect screen.

In the selection circuit 3, a desired one of the fundamental waves generated in the fundamental wave generation circuit 2 is selected by horizontal and vertical fundamental wave selection signals from terminals 4 and 5.

The comparison forming circuit 6 compares at least one of the horizontal fundamental wave and the vertical fundamental wave from the selection circuit 3 with the horizontal and vertical fader voltages sent from the terminals 7 and 8 to the feeder wheel, and generates a gate signal for image signal switching. is created and sent to terminal 9 with its level constant. To explain the operation corresponding to the screen in FIG. 1, S in FIG. 3 is a sawtooth wave selected from the selection circuit 3, and S2 is the horizontal fader voltage from the terminal 5.

S, and S2 are compared to obtain a gate signal S3 for switching. If the level of the feeder voltage S2 is changed here, the timing of switching by the gate signal S3 is changed, and a screen as shown in FIG. 1 is obtained. However, with the effect generator shown in FIG. 2, it was not possible to create an effect such as rotating the boundaries of the screen.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a television effect waveform generator that allows the boundaries of the screen to be rotated by varying the fader voltage.

According to the present invention, a control amplifier circuit is added to the conventional effect waveform generator, and the gain of the vertical fundamental wave from the selected frequency is changed according to the fader voltage.

Then, by comparing the vertical fundamental wave whose gain has been changed with the horizontal fundamental wave, a gate signal in which the boundary rotates can be obtained. The invention will now be described in detail with reference to the drawings, which show embodiments of the invention.

FIG. 4 is a basic configuration diagram of an effect waveform generator according to the present invention, and the second one is a diagram in which a control amplifier circuit 10 is added compared to the configuration of a conventional effect generator.

At the same time, in order to select the vertical fundamental wave supplied to the control amplifier circuit 10', a vertical fundamental wave selection input is applied from the terminal 11 to the selection circuit 3'. The fundamental wave selected thereby enters the control amplifier circuit 101. In addition, the control amplifier circuit 1
The horizontal fader voltage is connected to the terminal 7. The gain of the control amplifier circuit is controlled by the fader voltage. In FIG. 4, feeding the horizontal fader voltage from terminal 7 directly to comparison shaping circuit 6 without passing through control amplifier 10 provides the same functionality as the effect generator of FIG.

FIG. 5 is an example of a screen obtained by the effect waveform generator according to the invention, in which the boundary between the two screens is rotated.

To explain the operation corresponding to the screen in FIG. 6, S4 in FIG. 6 is a sawtooth wave which is one of the horizontal fundamental waves selected by the selection circuit 3 and supplied to the comparison shaping circuit 6, and S5 is a sawtooth wave which is one of the horizontal fundamental waves selected by the selection circuit 3 and supplied to the comparison shaping circuit 6. 1 of the vertical fundamental wave selected by the selection example from 1
The sawtooth wave is a signal whose level is controlled by the horizontal fader voltage in the control amplifier circuit 10. S4
and S5 are compared to obtain a gate signal for screen switching. At this time, the gain of the control amplifier circuit 10 changes depending on the horizontal fader voltage, so if the horizontal fader voltage is changed, the gate signal for screen switching is obtained. You will get a screen like this.
When the operation shown in FIG. 5 is performed, the fundamental wave with the horizontal period selected by the selection circuit 3' and the vertical frequency which is accelerated by the selection circuit from the terminal 11 and whose gain is controlled by the horizontal fader voltage by the control amplifier 10 are used. Only the fundamental wave of is used.

Other signals are not used in this case. The output of the control amplifier circuit 10 not only changes depending on the horizontal fader pressure, but also by changing its polarity or changing it continuously as shown in FIG. 7, various screen changes can be created.

FIG. 8 is a diagram showing changes in the screen when a parabolic wave of the horizontal fundamental waves is used, and FIG. 9 is a waveform for explaining the operation at that time.

In FIG. 9, S6 is a parabolic wave which is one of the flat fundamental waves, and S7 is the output from the control amplifier circuit 10.
The tenth is a diagram showing changes when a triangular wave among the horizontal fundamental waves is used.

Also in this case, what is output from the control amplifier circuit 10 is a sawtooth wave. In the above explanation, the output from the control amplifier circuit was all sawtooth waves, but in addition to these, there were also triangular waves,
By using parabolic waves, square waves, etc., and combining them with the horizontal fundamental wave, even more diverse effects can be created. In addition, in the effect generator shown in FIG. The effect screen when compared is the 11th
As shown in the figure.

In order to create the effect shown in FIG. 11, a triangular wave is selected as the horizontal fundamental wave, and the vertical periodic fundamental wave that is sent to the control amplifier circuit 10, whose gain is changed by the horizontal fader voltage, and enters the comparison shaping circuit is a triangular wave. Furthermore, the operation of supplying a triangular wave as the fundamental wave of the vertical period to the comparison shaping circuit and comparing it with the vertical fader voltage from the terminal 8 may be repeated.

[Brief explanation of the drawing]

Figure 1 is a block diagram of a conventional effect waveform generator, Figure 2 is an example of an effect screen obtained using the conventional effect waveform generator, and Figure 3 is an example of an effect screen obtained using the conventional effect waveform generator.
The figures show the waveforms of each part of the effect waveform generator in the case of Fig. 2, Fig. 4 is a configuration diagram of the effect waveform generator of the present invention, and Fig. 5.
8, 10, and 11 are examples of effect screens obtained by the effect waveform generator of the present invention, FIG. 6 is the waveform of each part of the effect waveform generator for the effect shown in FIG. 5, and FIG. 7 is 9 is a diagram showing an example of the output from the control amplifier circuit in the effect waveform generator of the present invention, and FIG. 9 is a waveform of each part of the effect waveform generator in the case of the effect shown in FIG. In the figure, 2...Fundamental wave generation circuit, 3, 3'...
Selection circuit, 6... Comparison shaping circuit, 10... Control amplification circuit. Tsutomu' 2 figures bush 3 figures 4 figures Tsutomu 3 figures many d figures 7 figures thick zuchin? Figure groove '0 figure clean figure

Claims (1)

[Claims] 1. A fundamental wave generation circuit that generates horizontal and vertical fundamental waves that are the basis for creating special effects, a control amplifier circuit that controls the level of the vertical fundamental wave according to the fader control voltage, and the control amplifier circuit. 1. An effect waveform generator comprising: a comparison shaping circuit that compares the level-controlled vertical fundamental wave from the horizontal fundamental wave with the horizontal fundamental wave to obtain a screen switching signal.